socat / ghostscript questions

[Paul Procacci]

The hang is most likely because an EOF doesn't get trasmitted over the wire.
Adding a timeout I believe should fix the problem.

nc -w 1 [addr] [port] < filename.txt

On Tue, Apr 20, 2021 at 11:51 AM James B. Byrne via freebsd-questions <
freebsd-questions at freebsd.org> wrote:

> I am trying to produce pdf files using socat and ghostscript.  I have this
> command for socat:
>
> socat TCP4-LISTEN:9100,bind=192.168.216.41,fork,reuseaddr SYSTEM:'gs
> -dQUIET
> -dNOPROMPT -dBATCH -sDEVICE=pdfwrite -sOutputFile=/tmp/\"$(date
> -Iseconds)\".pdf -'
>
>
> Which I try to send a text file to using cat and nc:
>
> cat sshpipe3.txt | nc 192.168.216.41 9100
>
>
> What happens is that the cat/nc pipe hangs.  This is probably an artifact
> of
> how nc works but I need to check that is so.  When I terminate nc with
> <ctrl>-c
> the socat gs instance reports an error:
>
> GPL Ghostscript 9.52: Unrecoverable error, exit code 1
> 2021/04/20 11:32:51 socat[67296] E write(6, 0x800adf000, 128): Broken pipe
>
> This produces an empty file named like /tmp/2021-04-20T11:13:20-04:00.pdf.
>
> I am no doubt missing the obvious here so I have a few naive questions:
>
> 1. Is it possible to terminate the sending process without causing GS to
> issue
> an error?
>
> 2. Would printing from another host to that socat instance result in the
> same
> broken pipe error?
>
> 3. Why are the files that gs creates empty?
>
> 4. How do I send a text file to the socat instance so that it is converted
> to a
> pdf document?
>
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